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Shading regions of the normal: The Stanine scale

June 26, 2012
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Shading regions of the normal: The Stanine scale

For the presentation of norm values, often stanines are used (standard nine). These values mark a person’s relativ position in comparison to the sample or to norm values. According to Wikipedia: The underlying basis for obtaining stanines is that a normal distribution is divided into nine intervals, each of which has a width of 0.5

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Comparing all quantiles of two distributions simultaneously

April 13, 2012
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Comparing all quantiles of two distributions simultaneously

Summary: A new function in the WRS package compares many quantiles of two distributions simultaneously while controlling the overall alpha error. When comparing data from two groups, approximately 99.6% of all psychological research compares the central tendency (that is a … Continue reading →